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Types of Redox Reactions

In the estima...

Question

In the estimation of nitrogen by Kjeldahl's method. 2.8 gm of an organic compound required 20 millimole of $H_{2} S O_{4}$ for the complete neutralisation of $N H_{3}$ gas evolved. The percentage of nitrogen in the sample is:

A

20%

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B

10%

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C

40%

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D

30%

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Solution

The correct option is A 20%
Percentage of $N = \frac{1.4 \times m E q . o f H_{2} S O_{4} u s e d t o n e u t r a l i s e N H_{3}}{W e i g h t o f c o m p o u n d}$
millimoles of $H_{2} S O_{4} = 20$
milliequivalent of $H_{4} S O_{4} = 20 \times 2 = 40$
Percentage of $N$ in the sample $= \frac{1.4 \times 40}{2.8} = 20$ %

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